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promptfooWhat its open source looked like when it raised

Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, Llama, and more. Simple declarative configs with command line and CI/CD integration. Used by OpenAI and Anthropic.

Website
promptfoo.dev
Repository
promptfoo/promptfoo
First commit
Stars today
24,780
Forks
2,257

The round

Funding announced 1 Jul 2025

$17.5M
Source: database, sec.gov

The repository was 26 months old on the day the round was announced.

Monthly reconstruction

GitHub stars, 1 May 2023 – 1 Mar 2026

35 observations · one per month

2,1304,2606,3908,520 1 Jul 2025 — round announced 6,821 9,529 Jun ’23Sep ’23Dec ’23Mar ’24Jun ’24Sep ’24Dec ’24Mar ’25Jun ’25Sep ’25Dec ’25Mar ’26
Stars, reconstructed month by month Funding announcement

What the curve says

The announcement did not visibly change the slope

In the 365 days to 1 Jul 2025 the repository added 3,364 stars. In the 243 days after, it added 2,708 — a rate 1.2× higher.

6,821
stars on 1 Jul 2025, the last reading before the round
9.2/day
1 Jul 2024 – 1 Jul 2025, before
11.1/day
1 Jul 2025 – 1 Mar 2026, after

What this does not show

  • Stars measure attention, not revenue, adoption or retention.
  • Each point is a month-end reading reconstructed from public event data, not a direct observation. Movement inside a month is invisible here, and the level can be understated.
  • A single launch post can produce a step like this without any change in usage.

We have been recording promptfoo/promptfoo since 1 May 2023.

Finding companies at that stage is the product. Contributor pedigree, enterprise-demand signals and our ranking sit behind the login.

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